Those reversal kits look like they are built well. I wouldn't be afraid to try 'em. 4-5" of lift should not give you huge driveshaft problems, although the shims for the rear pumkin are reccomended. Much of this has to do with how you are going to run the truck. If you are going for big air a Glamis, you will need limiting straps to keep from over extending your leaves and driveshafts. If your brake lines are in good shape, you can relocate your transition to under the frame and have enough line to get the job done.
4" of spring lift may not need dropped pitman arm. That is used to correct steering geometry and take the harsh angle away from your drag link.
Yes, similar to add a leaf I was mentioning. I would AAL front to bring truck closer to level and use air bags in rear when carring heavy loads. An AAL will make the spring pack stiffer. This usually isn't real noticable in the front with our heavy engine and the addition of winches, bumpers, plows and such. AAL is more noticable in rear as it is rather light when empty and there is no way to adjust it.
Twin stabilizers may be overkill for 4" and 35's. Again, a desert prerunner may need twins, its all about what you are going to do.
My truck is my daily driver, heavy hauler/tow rig and sees toting my family of six as well. I am absolutely happy with my front AAL and rear air bags. Rides well empty, no air in bags. 80psi of air will let you haul 5000lbs or tow 21,000lbs without sagging.
None of my shocks, steering or brakes have been changed or affected. A 2" body lift in addition to this or a sawsall and a pair of ****
will clear 35's I'm sure.
This is just an outline of what works for me. Good luck and keep us posted on what you decide to do and post pics of the install, we'll be watching.
my truck is going to need a new set of tires soon and i was wanting to run some 35`s this time around. but i need to lift my truck a little bit can somebody point me in a direction i was thinking since im getting those bilstein shocks might as well do this too 
